CN115037583A

CN115037583A - Wireless transceiver with in-phase and quadrature-phase correction function

Info

Publication number: CN115037583A
Application number: CN202110242737.4A
Authority: CN
Inventors: 施冠宇; 张家润
Original assignee: Realtek Semiconductor Corp
Current assignee: Realtek Semiconductor Corp
Priority date: 2021-03-05
Filing date: 2021-03-05
Publication date: 2022-09-09
Anticipated expiration: 2041-03-05
Also published as: CN115037583B

Abstract

The application discloses a wireless transceiver with in-phase quadrature-phase (IQ) correction function, which comprises a transmitter, a receiver, a signal generator and a switch circuit. The switch circuit comprises a first switch circuit and a second switch circuit. The first switch circuit is used for conducting in a receiving end calibration procedure so as to output a default signal of the signal generator to the transmitter. The second switch circuit is turned on during the receiver calibration procedure to output a derivative of the default signal from the transmitter to the receiver, thereby enabling the receiver to perform a receiver IQ calibration accordingly. The first switch circuit is not conducted in a transmission end calibration procedure. The second switch circuit is turned on in the transmitter calibration procedure to output an RF transmission signal from the transmitter to the receiver, so that the receiver generates a calibration reference to the transmitter for the transmitter to perform a transmitter IQ calibration accordingly.

Description

Wireless transceiver with in-phase and quadrature-phase correction function

Technical Field

The present invention relates to a wireless transceiver, and more particularly, to a wireless transceiver with in-phase and quadrature-phase correction functions.

Background

Radio frequency transceivers often transmit/receive signals using in-phase and quadrature phase modulation/demodulation (IQ modulation/demodulation). During transmission, the rf transceiver boosts the frequencies of the in-phase path signal and the quadrature-phase path signal, which have the same amplitude and are 90 degrees out of phase, to rf frequency through the local oscillator, and then transmits the signals. For example, the in-phase signal I ═ sin (2 × pi × f × t), and the quadrature-phase signal Q ═ sin (2 × pi × f × t-90), where f is frequency and t is time; if f is 10MHz, the frequency of the oscillation signal of the local oscillator is 2412MHz, and the frequency of the signal after frequency increase is 2412+10, 2422 MHz. Due to differences in circuit components of the in-phase path and the quadrature-phase path, signals (e.g., differential signals) composed of the in-phase signal and the quadrature-phase signal cannot be perfectly matched, which results in a signal at 2402MHz (2412-10). The signal at frequency 2422MHz is referred to as the desired signal, the signal at frequency 2402MHz is referred to as the image signal, and dividing the magnitude of the image signal by the magnitude of the desired signal is referred to as the Image Rejection Ratio (IRR), which is typically expressed in dB. The better the transceiver will generally have a lower IRR, and in order to achieve a lower IRR, the transceiver needs to compensate for the in-phase signal and the quadrature-phase signal.

One current compensation technique is to output a given sine wave signal to an in-phase path and a quadrature-phase path of a receiver of a transceiver, so that the receiver observes the difference between the signal of the in-phase path and the signal of the quadrature-phase path, thereby performing receiver IQ calibration; after completing the IQ calibration at the receiving end, the compensation technique uses the calibrated receiver to receive the RF transmission signal of the transmitter of the transceiver, so that the receiver outputs an observation result to the transmitter according to the difference between the signal of the in-phase path and the signal of the quadrature-phase path, thereby allowing the transmitter to perform the IQ calibration at the transmitting end accordingly. However, since the rf front-end circuit of the receiver is not completely identical to the rf front-end circuit of the transmitter, the circuit symmetry and the output impedance of the receiver during the IQ calibration at the receiving end are different from the circuit symmetry and the output impedance of the receiver during the IQ calibration at the transmitting end, so the IQ calibration at the receiving end performed by the receiver before is not completely suitable for the IQ calibration at the transmitting end performed later, and thus the current compensation technique is difficult to achieve very low IRR.

Related prior art can be found in U.S. patent No. US8559488B 1.

Disclosure of Invention

An object of the present invention is to provide a wireless transceiver with in-phase quadrature-phase (IQ) correction function, which avoids the problems of the prior art.

One embodiment of the present invention provides a wireless transceiver with IQ correction function, which includes a transmitter, a receiver, a signal generator and a switch circuit. The transmitter includes a transmitter digital circuit and a transmitter analog circuit. The receiver includes a receiver analog circuit and a receiver digital circuit. The signal generator is used for generating a default signal in a receiving end calibration procedure. The switch circuit comprises a first switch circuit and a second switch circuit. The first switch circuit is coupled to the signal generator and the transmitter in the receiving-end calibration procedure, and the second switch circuit is coupled to the transmitter and the receiver in the receiving-end calibration procedure. The first switch circuit is not conducted in a transmission end calibration procedure, and the second switch circuit is coupled with the transmitter and the receiver in the transmission end calibration procedure.

As mentioned above, the transmitting end digital circuit is used for outputting a digital transmitting signal. The transmitter analog circuit is coupled to the transmitter digital circuit and includes a digital-to-analog conversion circuit, a transmitter mixer circuit, and a transmitter RF front end circuit. The digital-to-analog conversion circuit is used for converting the digital transmission signal into an analog transmission signal. The transmitting-end mixing circuit comprises a transmitting-end in-phase path mixing circuit and a transmitting-end quadrature-phase path mixing circuit. The transmitter in-phase path mixer circuit is disabled during the receiver calibration procedure and enabled during the transmitter calibration procedure to generate a transmitter in-phase path up-converted signal based on a transmitter in-phase path signal derived from the analog transmit signal. The transmitting end orthogonal phase path frequency mixing circuit is disabled in the receiving end correction procedure and enabled in the transmitting end correction procedure so as to generate a transmitting end orthogonal phase path frequency boosting signal according to a transmitting end orthogonal phase path signal derived from the analog transmission signal, wherein the transmitting end in-phase path frequency boosting signal and the transmitting end orthogonal phase path frequency boosting signal form a radio frequency transmission signal. The transmitter RF front-end circuit includes a plurality of stages of RF transmitter circuits, which are disposed between the transmitter mixer circuit and an antenna.

As mentioned above, the receiving end analog circuit includes a receiving end rf front end circuit, a receiving end mixer circuit, and an analog-to-digital conversion circuit. The receiving end radio frequency front end circuit comprises at least one stage of radio frequency receiving circuit which is positioned between the antenna and a receiving end mixing circuit. The receiving end mixing circuit is coupled with the receiving end radio frequency front end circuit and comprises a receiving end in-phase path mixing circuit and a receiving end quadrature-phase path mixing circuit. The receiving-end in-phase path mixer circuit is used for generating a receiving-end in-phase path down-conversion signal according to a receiving signal, wherein the receiving signal is derived from the default signal in the receiving-end calibration procedure, and the receiving signal is derived from the radio-frequency transmission signal in the transmitting-end calibration procedure. The receiving end quadrature phase path frequency mixing circuit is used for generating a receiving end quadrature phase path frequency reduction signal according to the receiving signal. The analog-to-digital conversion circuit is used for converting the receiving end in-phase path frequency-reducing signal or a derivative signal thereof into an in-phase path digital receiving signal and converting the receiving end quadrature phase path frequency-reducing signal or a derivative signal thereof into a quadrature phase path digital receiving signal. The receiving end digital circuit is used for executing receiving end IQ correction according to a first difference between the in-phase path digital receiving signal and the quadrature-phase path digital receiving signal in the receiving end correction program. The receiving digital circuit is further used for outputting a calibration reference to the transmitting digital circuit according to a second difference between the in-phase path digital receiving signal and the quadrature-phase path digital receiving signal in the transmitting calibration procedure, so that the transmitting digital circuit can perform transmitting IQ calibration according to the calibration reference.

As mentioned above, the first switch circuit is coupled between the signal generator and the transmitting end rf front-end circuit, and is used for conducting in the receiving end calibration procedure to output the default signal to the transmitting end rf front-end circuit. The second switch circuit is coupled between the transmitting end radio frequency front end circuit and the receiving end radio frequency front end circuit, and is used for conducting in the receiving end calibration program to output a derivative signal of the default signal to the receiving end radio frequency front end circuit, so that the receiving end mixing circuit and the analog-to-digital conversion circuit generate the in-phase path digital receiving signal and the quadrature phase path digital receiving signal according to the derivative signal, the receiving end digital circuit outputs the calibration reference to the transmitting end digital circuit according to the first difference between the in-phase path digital receiving signal and the quadrature phase path digital receiving signal, and the transmitting end digital circuit executes the transmitting end IQ calibration according to the calibration reference.

As mentioned above, the first switch circuit is not turned on in the transmitting end calibration procedure. The second switch circuit is turned on in the transmitting end calibration program to output a derivative signal of the radio frequency transmitting signal to the receiving end radio frequency front end circuit, so that the receiving end mixing circuit and the analog-to-digital conversion circuit generate the in-phase path digital receiving signal and the quadrature phase path digital receiving signal according to the derivative signal, and the receiving end digital circuit executes the transmitting end IQ calibration according to the second difference between the in-phase path digital receiving signal and the quadrature phase path digital receiving signal.

Another embodiment of the present invention provides a wireless transceiver with IQ calibration function, comprising a transmitter, a receiver, a signal generator, and a switch circuit, wherein the switch circuit comprises a first switch circuit and a second switch circuit. The first switch circuit is coupled between the signal generator and the transmitter; the first switch circuit is used for conducting in a receiving end calibration program so as to output a default signal of the signal generator to the transmitter; the first switch circuit is used for non-conduction in a transmission end calibration procedure. The second switch circuit is coupled between the transmitter and the receiver; the second switch circuit is used for conducting in the receiving end correction program to output a derivative signal of the default signal from the transmitter to the receiver, so that the receiver executes receiving end IQ correction according to the derivative signal; the second switch circuit is further configured to be turned on in the tx calibration procedure to output an rf transmission signal from the transmitter to the receiver, so that the receiver generates a calibration reference to the transmitter according to the rf transmission signal, and the transmitter performs a tx IQ calibration according to the calibration reference.

The features, operation and efficacy of the present invention will be described in detail below with reference to the accompanying drawings.

Drawings

Fig. 1 shows an embodiment of a wireless transceiver with in-phase and quadrature-phase calibration according to the present application;

FIG. 2 shows details of the transmitter, receiver and switching circuit of FIG. 1;

FIG. 3 shows an embodiment of the transmitter analog circuit 114 and the receiver analog circuit 122 of FIG. 2;

FIG. 4a is a diagram illustrating an embodiment of the coupling relationship between the transmitting RF front-end circuit and the receiving RF front-end circuit and the switch circuit of FIG. 3; and

FIG. 4b shows another embodiment of the relationship between the transmitting RF front-end circuit and the receiving RF front-end circuit and the coupling relationship between the transmitting RF front-end circuit and the receiving RF front-end circuit and the switch circuit of FIG. 3.

[ description of symbols ]

100 wireless transceiver

110 conveyor

120 receiver

130 signal generator

140 switching circuit

112, transmitting end digital circuit

114 transmit side analog circuit

122 receiver analog circuit

124 receiving end digital circuit

142 first switch circuit (SW1)

144 second switch circuit (SW2)

1142 digital-to-analog conversion Circuit (DAC)

1144 Filter Circuit at Transmission end

1146 transmitting end mixer circuit

312 transmitting end in-phase path mixer circuit

314 quadrature phase path mixer circuit at transmission end

1148 radio frequency front end circuit of transmission end

1222 RF front-end circuit at receiving end

1224 receiving end mixer circuit

322 receiver in-phase path mixer circuit and

324 receiving end quadrature phase path mixer circuit

1226 Filter Circuit at the receiving end

1228 analog to digital conversion Circuit (ADC)

412 power amplifier driver (PA driver)

414 Power Amplifier (PA)

422 Low Noise Amplifier (LNA)

Detailed Description

The present application discloses a wireless transceiver with in-phase quadrature-phase (IQ) calibration function, wherein the circuit symmetry and output impedance seen by a receiver of the wireless transceiver at a receiving end during IQ calibration are the same as/similar to the circuit symmetry and output impedance seen by the receiver at a transmitting end during IQ calibration, thereby realizing a lower IRR after IQ calibration.

Fig. 1 shows an embodiment of a wireless transceiver with IQ calibration function according to the present application. The wireless transceiver 100 with IQ calibration (e.g., a WLAN transceiver or a Bluetooth transceiver) of FIG. 1 comprises a transmitter 110, a receiver 120, a signal generator 130 and a switch circuit 140. Fig. 2 shows details of the transmitter 110, the receiver 120 and the switch circuit 140 of fig. 1. As shown in fig. 2, the transmitter 110 includes a transmitter digital circuit 112 and a transmitter analog circuit 114; the receiver 120 includes a receiver analog circuit 122 and a receiver digital circuit 124; the switch circuit 140 includes a first switch circuit (SW1)142 and a second switch circuit (SW2) 144.

Please refer to fig. 1-2. The first switch circuit 142 is turned on in a receiver calibration procedure to couple the signal generator 130 and the transmitter 110, so as to output a default signal (e.g., a sine wave) generated by the signal generator 130 (e.g., a single tone generator) to the transmitter 110. The second switch circuit 144 is turned on in the receiver calibration procedure to couple the transmitter 110 and the receiver 120, so as to output a derivative signal of the default signal from the transmitter 110 (i.e., the default signal transmitted by the transmitter 110) to the receiver 120; therefore, the receiver 120 performs a receiver IQ calibration according to the derived signal. It is noted that in the receiver calibration procedure, the mixer circuit of the transmitter 110 is disabled to avoid the output signal interfering with the default signal.

Please refer to fig. 1-2. The first switch circuit 142 is not turned on during a transmit side calibration procedure. The second switch circuit 144 is turned on during the transmitter calibration procedure to couple the transmitter 110 and the receiver 120, so as to output a radio frequency transmission signal from the transmitter 110 to the receiver 120; therefore, the receiver 120 outputs a calibration reference to the transmitter 110 according to the rf transmission signal, so that the transmitter 110 performs a transmit-end IQ calibration according to the calibration reference.

Accordingly, in both the receiver calibration procedure and the transmitter calibration procedure, the signal received by the receiver 120 passes through the rf front-end circuit of the transmitter 110; therefore, the receiver IQ calibration and the transmitter IQ calibration are both based on the same/similar characteristics of the rf front-end circuit, so that the wireless transceiver 100 can achieve a better image rejection ratio (image rejection ratio;

IRR)。

fig. 3 shows an embodiment of the transmitting side analog circuit 114 and the receiving side analog circuit 122 of fig. 2. As shown in fig. 3, the transmitter analog circuit 114 is coupled to the transmitter digital circuit 112, and includes: a digital-to-analog conversion circuit (DAC) 1142; a transmit side filter circuit 1144; a transmit side mixer 1146 comprising a transmit side in-phase path mixer 312 and a transmit side quadrature-phase path mixer 314; and a tx rf front-end circuit 1148, wherein the tx filter circuit 1144 may be omitted if the tx analog circuit 114 has no filtering requirement. The receiver analog circuit 122 is coupled to the receiver digital circuit 124, and includes: a receiving rf front-end circuit 1222; a receiver mixer circuit 1224 including a receiver in-phase path mixer circuit and 322 a receiver quadrature-phase path mixer circuit 324; a receiving-end filter circuit 1226; and an analog-to-digital conversion circuit (ADC)1228, wherein the receiver filter circuit 1226 may be omitted if the receiver analog circuit 122 has no filtering requirement. It should be noted that each of the digital-to-analog conversion circuit 1142, the transmit filter circuit 1144 and the transmit mixer circuit 1146 includes two circuits for processing the in-phase signal and the quadrature-phase signal respectively; similarly, each of the receiving-side mixing circuit 1224, the receiving-side filtering circuit 1226, and the receiving-side analog-to-digital conversion circuit 1228 includes two circuits for processing an in-phase signal and a quadrature-phase signal, respectively. The above-mentioned techniques for processing the in-phase signal and the quadrature-phase signal separately are well known in the art, and details thereof are omitted herein.

Please refer to fig. 1-3. The transmitter digital circuit 112 is used for outputting a digital transmission signal. The digital-to-analog conversion circuit 1142 is used to convert the digital transmission signal into an analog transmission signal. The transmit filter circuit 1144 is used to filter the analog transmit signal. The tx in-phase path mixer 312 is disabled (e.g., stops generating or stopping outputting signals) during the rx calibration procedure, and is enabled during the tx calibration procedure to generate a tx in-phase path up-converted signal according to a tx in-phase path signal derived from the analog tx signal (i.e., the in-phase portion of the output signal of the filter circuit 1144) and a first oscillating signal (LO _ I) of a local oscillator (not shown). The tx quadrature-phase path mixer 314 is disabled (e.g., stops generating or stopping outputting signals) during the rx calibration procedure, and is enabled during the tx calibration procedure to generate a tx quadrature-phase path up-converted signal according to a tx quadrature-phase path signal derived from the analog tx signal (i.e., the quadrature-phase portion of the output signal of the filter circuit 1144) and a second oscillator signal (LO _ Q) (not shown) of the local oscillator, wherein the tx in-phase path up-converted signal and the tx quadrature-phase path up-converted signal form an rf tx signal.

Please refer to fig. 1-3. The tx rf front-end circuit 1148 includes multiple stages of rf transmit circuits between the tx mixing circuit 1146 and an antenna (not shown), which may or may not be included in the wireless transceiver 100. The first switch circuit 142 has one end coupled to the signal generator 130 and the other end coupled to an input terminal of any one of the stages of the multi-stage rf transmitting circuit. One embodiment of the multi-stage rf transmitting circuit and the coupling relationship between the multi-stage rf transmitting circuit and the first switch circuit 142 is shown in fig. 4a/4 b; the multistage rf transmitting circuit includes a power amplifier driver (PA driver)412 and a Power Amplifier (PA) 414, which is not limited by the present invention.

Please refer to fig. 1-3. The receiving rf front-end circuit 1222 comprises at least one rf receiving circuit, which is located between the antenna and the receiving mixing circuit 1224. One end of the second switch circuit 144 is coupled to the output terminal of any one of the stages of the rf transmitting circuit, and the other end is coupled to the output terminal or the input terminal of the at least one stage of the rf receiving circuit. One embodiment of the at least one stage of rf receiving circuit and the coupling relationship between the at least one stage of rf receiving circuit and the second switch circuit 144 is shown in fig. 4a/4 b; the at least one stage of rf receiving circuit includes a Low Noise Amplifier (LNA) 422, which is not a limitation of the present invention.

Please refer to fig. 1-3. The receiver in-phase path mixer 322 is configured to generate a receiver in-phase path down-converted signal according to a receiving signal derived from the default signal via the first switch circuit 142 and the second switch circuit 144 in the receiver calibration procedure and the first oscillating signal (LO _ I) derived from the rf transmitting signal via the second switch circuit 144 in the transmitter calibration procedure. The rx-quadrature-phase path mixer 324 is configured to generate an rx-quadrature-phase down-converted signal according to the received signal and the second oscillating signal (LO _ Q). The receiver filter circuit 1226 is used to filter the receiver in-phase path down-converted signal and the receiver quadrature-phase path down-converted signal. The analog-to-digital conversion circuit 1228 is used to convert the receiving-side in-phase path down-converted signal or its derivative (i.e., the in-phase portion of the output signal of the filter circuit 1226) into an in-phase path digital received signal, and convert the receiving-side quadrature-phase path down-converted signal or its derivative (i.e., the quadrature-phase portion of the output signal of the filter circuit 1226) into a quadrature-phase path digital received signal. The receiver digital circuit 124 is configured to perform the receiver IQ calibration according to a first difference between the in-phase path digital received signal and the quadrature-phase path digital received signal in the receiver calibration procedure. The rx digital circuit 124 is further configured to output the calibration reference to the tx digital circuit 112 according to a second difference between the in-phase path digital received signal and the quadrature-phase path digital received signal in the tx calibration procedure, so that the tx digital circuit 112 performs the tx IQ calibration according to the calibration reference.

In an exemplary embodiment, the first difference includes a first amplitude difference and a first phase difference, and the second difference includes a second amplitude difference and a second phase difference; in the receiver calibration procedure, the receiver digital circuit 124 performs the receiver IQ calibration according to the first amplitude difference and the first phase difference; in the tx calibration procedure, the rx digital circuit 124 outputs the calibration reference to the tx digital circuit 112 according to the second amplitude difference and the second phase difference, so that the tx digital circuit 112 performs the tx IQ calibration according to the calibration reference. In an exemplary embodiment, the receiver digital circuit 124 performs the receiver IQ calibration to compensate for the first amplitude difference and the first phase difference; the tx digital circuit 112 performs the tx IQ calibration according to the calibration reference to compensate for the second amplitude difference and the second phase difference. In one embodiment, the receiver digital circuit 124 performs the receiver IQ calibration to make the first amplitude difference equal to zero or close to zero and the first phase difference equal to 90 degrees or close to 90 degrees; the tx digital circuit 112 performs the tx IQ calibration according to the calibration reference to make the second amplitude difference equal to zero or close to zero and make the second phase difference equal to 90 degrees or close to 90 degrees. Since the compensation operation can be implemented by known or self-developed techniques (e.g., adjustment of circuit parameters), the details thereof are omitted here.

It should be noted that although the signals processed by the embodiments of fig. 1-4b are differential signals, this is not a limitation of the present invention. One of ordinary skill in the art can modify the circuit of the present invention to enable the circuit of the present invention to process single-ended signals according to the present application.

It should be noted that, when the implementation is possible, a person skilled in the art can selectively implement some or all of the technical features of any of the above embodiments, or selectively implement a combination of some or all of the technical features of the above embodiments, thereby increasing the flexibility in implementing the invention.

To sum up, the wireless transceiver of the present application can realize better IRR.

Although the embodiments of the present invention have been described above, these embodiments are not intended to limit the present invention, and those skilled in the art can make variations on the technical features of the present invention according to the explicit or implicit contents of the present invention, and all such variations are possible within the scope of the patent protection sought by the present invention, in other words, the scope of the patent protection sought by the present invention should be determined by the claims of the present specification.

Claims

1. A wireless transceiver having in-phase and quadrature-phase (IQ) correction, comprising: a transmitter, comprising:

a transmitting end digital circuit for outputting a digital transmitting signal;

a transmitter analog circuit coupled to the transmitter digital circuit, comprising:

a digital-to-analog conversion circuit for converting the digital transmission signal into an analog transmission signal;

a transmit side mixer circuit, comprising:

a transmitter in-phase path mixer circuit, for being disabled during a receiver calibration procedure and enabled during a transmitter calibration procedure, for generating a transmitter in-phase path up-converted signal according to a transmitter in-phase path signal derived from the analog transmission signal; and

a transmitting end quadrature phase path mixer circuit, which is used for being disabled in the receiving end calibration procedure and is also used for being enabled in the transmitting end calibration procedure so as to generate a transmitting end quadrature phase path up-conversion signal according to a transmitting end quadrature phase path signal derived from the analog transmitting signal, wherein the transmitting end in-phase path up-conversion signal and the transmitting end quadrature phase path up-conversion signal form a radio frequency transmitting signal; and

a transmit end rf front end circuit, comprising:

the multi-stage radio frequency transmission circuit is positioned between the transmission end mixing circuit and an antenna; a receiving circuit, comprising:

a receiver analog circuit, comprising:

a receiver rf front-end circuit, comprising:

at least one stage of radio frequency receiving circuit, which is positioned between the antenna and a receiving end mixing circuit;

the receiving end mixing circuit is coupled with the receiving end radio frequency front end circuit and comprises:

a receiving end in-phase path mixer circuit for generating a receiving end in-phase path down-converted signal according to a receiving signal, wherein the receiving signal is derived from a default signal in the receiving end calibration procedure, and the receiving signal is derived from the radio frequency transmission signal in the transmitting end calibration procedure; and

a receiving end quadrature phase path mixer circuit for generating a receiving end quadrature phase path down-conversion signal according to the receiving signal; and

an analog-to-digital conversion circuit for converting the receiving end in-phase path down-converted signal or its derivative signal into an in-phase path digital receiving signal and converting the receiving end quadrature phase path down-converted signal or its derivative signal into a quadrature phase path digital receiving signal;

a receiving end digital circuit for executing a receiving end IQ correction according to a first difference between the in-phase path digital receiving signal and the quadrature-phase path digital receiving signal in the receiving end correction program, the receiving end digital circuit being further used for outputting a correction reference to the transmitting end digital circuit according to a second difference between the in-phase path digital receiving signal and the quadrature-phase path digital receiving signal in the transmitting end correction program, so that the transmitting end digital circuit can execute a transmitting end IQ correction according to the correction reference;

a signal generator for generating a default signal in the calibration procedure of the receiving end; and

a switching circuit, comprising:

a first switch circuit, coupled between the signal generator and the transmitting end RF front-end circuit, for conducting during the receiving end calibration procedure and not conducting during the transmitting end calibration procedure; and

the second switch circuit is coupled between the transmitting end RF front-end circuit and the receiving end RF front-end circuit and is used for conducting the receiving end calibration program and the transmitting end calibration program.

2. The wireless transceiver of claim 1, wherein:

each stage of the multistage radio frequency transmission circuit comprises N transmission input ends and N transmission output ends; the first switch circuit comprises N first signal input ends and N first signal output ends; the N first signal input ends are coupled with the signal generator to receive the default signal; the N first signal output terminals are coupled to the N transmission input terminals of any stage of the multi-stage rf transmission circuit to output the default signal; n is a positive integer not greater than two; and

each stage of the at least one stage of radio frequency receiving circuit comprises N receiving input ends and N receiving output ends; the second switch circuit comprises N second signal input ends and N second signal output ends; the N second signal input terminals are coupled to the N transmission output terminals of any stage of the multi-stage rf transmission circuit to receive a derivative signal of the rf transmission signal; the N second signal output terminals are coupled to the N receiving input terminals or the N receiving output terminals of any one of the stages of the at least one stage of the rf receiving circuit to output the derived signal.

3. The wireless transceiver of claim 2, wherein each of the rf transmit signal and the receive signal is a differential signal, and N is equal to two.

4. The wireless transceiver of claim 2, wherein the multi-stage rf transmitting circuit includes a power amplifier driver and a power amplifier, and the at least one stage rf receiving circuit includes a low noise amplifier.

5. The wireless transceiver of claim 1, wherein the first difference comprises a first amplitude difference and a first phase difference, and the second difference comprises a second amplitude difference and a second phase difference; in the receiving end correcting program, the receiving end digital circuit executes the receiving end IQ correction according to the first amplitude difference and the first phase difference; in the tx calibration procedure, the receiving digital circuit outputs the calibration reference to the tx digital circuit according to the second amplitude difference and the second phase difference, so that the tx digital circuit performs the tx IQ calibration according to the calibration reference.

6. The wireless transceiver of claim 5, wherein said receiver digital circuit performs said receiver IQ calibration to compensate for said first amplitude difference and said first phase difference; the transmitter digital circuit performs the transmitter IQ correction according to the correction reference to compensate for the second amplitude difference and the second phase difference.

7. The wireless transceiver of claim 6, wherein said receiver digital circuit performs said receiver IQ calibration such that said first amplitude difference is equal to zero or approaches zero and said first phase difference is equal to 90 degrees or approaches 90 degrees; the transmitter digital circuit performs the transmitter IQ correction according to the correction reference, such that the second amplitude difference is equal to zero or approaches zero, and the second phase difference is equal to 90 degrees or approaches 90 degrees.

8. The wireless transceiver of claim 1, wherein the tx in-phase path mixer circuit is disabled by ceasing generation or output of the tx in-phase path up-conversion signal during the rx calibration procedure; the transmitting end quadrature phase path mixer circuit stops generating or outputting the transmitting end quadrature phase path up-conversion signal in the receiving end calibration procedure, thereby being disabled.

9. The wireless transceiver of claim 1, wherein the wireless transceiver does not include the antenna.

10. A wireless transceiver with in-phase and quadrature-phase calibration function, comprising a transmitter, a receiver, a signal generator and a switching circuit, wherein the switching circuit comprises:

a first switch circuit coupled between the signal generator and the transmitter, the first switch circuit being configured to be turned on during a receiver calibration procedure to output a default signal of the signal generator to the transmitter, the first switch circuit being further configured to be turned off during a transmitter calibration procedure; and

the second switch circuit is used for conducting in the receiving end correction program to output a derivative signal of the default signal from the transmitter to the receiver so as to enable the receiver to execute receiving end IQ correction according to the derivative signal, and is also used for conducting in the transmitting end correction program to output a radio frequency transmission signal from the transmitter to the receiver so as to enable the receiver to generate a correction reference to the transmitter according to the radio frequency transmission signal so as to enable the transmitter to execute transmitting end IQ correction according to the correction reference.